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Finding the Fourth Proportional to 279,117.80, 391,289.80 and 279,117.80

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Solution

The fourth proportional to 279,117.80, 391,289.80 and 279,117.80 is: 391,289.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,117.80 : 391,289.80 = 279,117.80 : x
  2. Step 2: Convert to fraction form
    279,117.80/391,289.80 = 279,117.80/x
  3. Step 3: Cross multiply
    279,117.80x = 391,289.80 × 279,117.80
  4. Step 4: Simplify right side
    279,117.80x = 109,215,948,138.44
  5. Step 5: Solve for x
    x = 109,215,948,138.44/279,117.80
  6. Step 6: Final answer
    x = 391,289.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.